Why is my Nissan Patrol's fuel efficiency getting worse?

I used to get great gas mileage on my Nissan Patrol, but lately it seems like it's getting worse. What could be causing this change and what can I do to improve it?

There could be several reasons for this change in fuel efficiency. The first thing you should check is your tire pressure. Underinflated tires can greatly affect your gas mileage. You should also make sure you are using the recommended grade of fuel for your Nissan Patrol.